good evening gentlemen here I am with regard to the projectors I solved thanks to you but I will explain in another post. Now I have had this problem for a long time, in lratica I want to create a directional speaker, at first I chose ultrasound as acouspade but those products cost too much, so some friends recommended line arrays to direct the sound. unfortunately they made me understand that they are difficult to drive and you need a higher level electronics but ik internet I discovered that directivity is a physical matter because being close to each other the speakers create a cylindrical wave and not a circular one. unfortunately I don't know how to do it, can you help me?